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| Titel |
Analysis of double-step response to an interplanetary shock in the dayside magnetosphere |
| VerfasserIn |
K. Andréeová, L. Juusola, E. K. J. Kilpua, H. E. J. Koskinen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 32, no. 10 ; Nr. 32, no. 10 (2014-10-22), S.1293-1302 |
| Datensatznummer |
250121122
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| Publikation (Nr.) |
 copernicus.org/angeo-32-1293-2014.pdf |
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| Zusammenfassung |
| We present an analysis of double-step magnetic field enhancement caused by
interplanetary (IP) shock impacts on the Earth's magnetosphere. The
structures were observed by the GOES-8, 10, 11, and 12 spacecraft in the
dayside geostationary orbit, particularly during northward interplanetary
magnetic field (IMF) conditions. The double-step structures, similar to what
is observed in the ground horizontal magnetic field (H) component at low
and mid latitudes, were observed preferentially on the dayside. Structures
observed around 12–15 magnetic local time (MLT) displayed the steepest
initial enhancement step, followed by a magnetic field strength decrease
before the second enhancement step. At other dayside MLTs of the
geostationary orbit, the initial response was smoother, and no decrease was
observed before the second step. We suggest that this MLT asymmetry in the
decrease of the total magnetic field is caused by the pushing of the
plasmaspheric ions over the geostationary orbit due to the magnetospheric
compression. |
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